Qwerty
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I propose coefficients of 2 for damage on unretaliated strikes and 1.5 for damage on double attacks.
Justification.
In a battle of 4 rounds, an unretaliated striker will deal 8 hits, while a normal unit deals 4 hits. 8 divided by 4 gives 2.
In a battle of 4 rounds, a double-attacker will deal 12 hits, while a normal unit deals 8 hits. 12 divided by 8 gives 1.5.
And this is without considering that the second strike may be dealt by fewer creatures than the first!
Added after 3 minutes
2 Zingel
Alternatively, another approach could be applied: how many pizants in one stack this unit can kill.
If they are in one stack, then one upgraded fairy will kill as many pizants as necessary.
Justification.
In a battle of 4 rounds, an unretaliated striker will deal 8 hits, while a normal unit deals 4 hits. 8 divided by 4 gives 2.
In a battle of 4 rounds, a double-attacker will deal 12 hits, while a normal unit deals 8 hits. 12 divided by 8 gives 1.5.
And this is without considering that the second strike may be dealt by fewer creatures than the first!
Added after 3 minutes
2 Zingel
Alternatively, another approach could be applied: how many pizants in one stack this unit can kill.
If they are in one stack, then one upgraded fairy will kill as many pizants as necessary.